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    <title>Document</title>
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    <div id="app">
      <h3>@keyup.enter → 监听键盘回车事件</h3>
      <!-- .enter按键修饰符, 按下并抬起回车键触发 -->
      <input @keyup.enter="fn" v-model="username" type="text" />
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          username: "",
        },
        methods: {
          fn() {
            console.log("我被触发了");
          },
        },
      });
    </script>
  </body>
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